CCM Atmospheric Science and Weather Analysis 3

Question 1

The Foehn effect, observed on the lee side of mountain ranges, produces warming primarily due to:

Accepted Answer

Adiabatic compression of descending air and latent heat release on the windward side

Answer

Foehn warming results from net latent heat released during condensation on the windward ascent, so the descending air on the leeward side is warmer than at the same altitude on the windward side.

Question 2

In the context of Numerical Weather Prediction (NWP), what is 'data assimilation'?

Accepted Answer

The mathematical technique to merge observations with a background forecast to produce the best initial state

Answer

Data assimilation (e.g., 3D-Var, 4D-Var, EnKF) combines observational data with a prior model state to create an optimal analysis that minimizes errors in the model initial conditions.

Question 3

The Madden-Julian Oscillation (MJO) primarily affects weather on which time scale?

Accepted Answer

Days to weeks (intraseasonal, 30-60 day)

Answer

The MJO is an eastward-propagating tropical convective anomaly with a characteristic period of 30-60 days, making it the dominant mode of intraseasonal variability in the tropics.

Question 4

Which atmospheric feature is characterized by a narrow corridor of strong upper-level winds and is critical for mid-latitude weather development?

Accepted Answer

Jet stream

Answer

Jet streams are narrow ribbons of fast-moving air (often exceeding 100 knots) at tropopause level that steer mid-latitude storm systems and influence cyclogenesis through upper-level divergence.

Question 5

The term 'precipitable water' (PW) refers to:

Accepted Answer

The total column water vapor if condensed into liquid at the surface

Answer

Precipitable water is the depth of liquid water that would result if all water vapor in a vertical atmospheric column were condensed, typically measured in inches or millimeters.

(CCM) Certified Consulting Meteorologist Practice Test

(CCM) Certified Consulting Meteorologist Practice Test

CCM Atmospheric Science and Weather Analysis 3